[docs] Use emacs-lsp docker image

Author: ericdallo

.github/workflows/docs.yml

@@ -25,7 +25,9 @@ jobs:
       - name: MkDocs
         run: |
           cp -rf screenshots docs
-          docker run --rm -v ${PWD}:/docs squidfunk/mkdocs-material -- build
+
+          docker login docker.pkg.github.com --username $GITHUB_ACTOR --password ${{ secrets.GITHUB_TOKEN }}
+          docker run --rm -v ${PWD}:/docs docker.pkg.github.com/emacs-lsp/docs-image/docs-image -- build
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3